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“All will probably be effectively should you use your thoughts to your selections, and thoughts solely your selections.” Since 2007, I’ve devoted my life to sharing the enjoyment of recreation principle and arithmetic. MindYourDecisions now has over 1,000 free articles with no advertisements because of neighborhood help! Assist out and get early entry to posts with a pledge on Patreon.
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This one comes from Math StackExchange.
A pupil stated that 1/2 is all the time larger than 1/4, illustrating with a circle space mannequin. However the trainer stated that was false as a result of 1/2 of a small circle’s space might be lower than 1/4 of a big circle’s space.
I imagine the coed is right and I shared just a few of my frustrations in a video.
Instructor’s fraction grading shocks web
The probelm jogged my memory of one other viral drawback generally known as Marty’s pizza. The coed stated 4/6 of Marty’s pizza might be greater than 5/6 of Lius’s pizza, if Marty’s pizza was massive sufficient. However the trainer additionally marked that improper!
One way or the other each lecturers have been improper about fractions. Marty’s pizza is certainly about evaluating fractions of various sized pizzas, whereas the 1/2 is larger than 1/4 is about evaluating absolutely the values of simply these fractions.
References
Math StackExchange
https://math.stackexchange.com/questions/2205890/apparently-sometimes-1-2-1-4?noredirect=1&lq=1
DunDunDunnn.wav by copyc4t https://en.wikipedia.org/wiki/File:Dun_dun_duuun!.ogg
CC BY 4.0
SciAm
https://www.scientificamerican.com/article/fractions-where-it-all-goes-wrong/
Why is studying fraction and decimal arithmetic so tough?
https://www.sciencedirect.com/science/article/abs/pii/S0273229715000362
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